Fan



Nov. 9, 1943. Q PQF F 2,333,673

FAN

Filed April 17, 1942 2 Sheets-Sheet l IN V EN TOR.

16 14 deo i/Zf'o ff Nov. 9, 1943. POFF- 2,333,673

FAN

Filed April 17, 1942 2 Sheets-Sheet 2 n i 7. I 36. D323 I 72 deg/z foff *0 I INVENTOR.

Patented Nov. 9, 1943 UNITED STATES PATENT oFFicE FAN Cecil Pofl, Talia, Tex.

Application 4C1aims.

My invention relates to air circulation, and has among its objects and advantages the provision of an improved fan embodying fan units so constructed and arranged asto cause impingement of two oppositely flowing air streamsto laterally deflect an air stream radially in all directions from the zone of impingement of the two air streams. I

In the accompanying drawings:

Figure l is an elevational view with certain parts broken away for the purpose of illustration;

Figure 2 is a sectional detail view of a bearin Figure 3 is a sectional detail view of another bearing;

Figure 4 is a view taken from the position indicated by line 4-4 of Figure 1;

Figure 5 is a sectional view of conduit for the fan motor;

Figure 6 is an elevational view of the fan structure;

Figure 'I is a top ture;

Figure 8 is a member; and

Figure 9 is a fragmentary view of a frame arm coacting with the frame member of Figure 8.

In the embodiment selected for illustration, 1 make use of a base H) which comprises a housing for a motor l2 mounted on the bottom l4 of the housing. This bottom is perforated, as at It, for the inlet of air to the housing. The motor shaft l8 extends vertically through a tubular neck 28 extending upwardly from the housing cover 22.

an air venting plan view of the fan struc- April 17, 194.2,Seria1 No. 439,413

fragmentary view of a frame Y are so tangentially arranged with respect to the circle described by the rotating fan assembly as to assist in the lateral deflection of the air radially in all directions.

An ornamental and protective frame structure 38 encloses the two fan units. This frame structure comprises vertical bars 48 having tenons 42 at their ends receivable inslots 44 in radial arms '48 and 48, Arms 46 are secured at their inner ends to ahub '58 secured to the upper end of the neck "28 while the inner ends of the arms 48 are secured to a hub '52. Figure 4 illustrates the inner ends of the arms 48 as being provided with tenons 54 secured within slots 58 in the hub 52. The arms 46 are secured to the hub 58 in the same manner. A thrust 58 is mounted and 52 for supporting the upper end of the shaft [8.

Figures 8 and 9 illustrate the end construction of one bar 48 and one of the arms 48. All the bars and arms 48 and 48 are similarly constructed at their ends. In Figure 9, the arm 48 includes a depending finger 62 having its slot 44 extending inwardly from its lower end. A notch 84 is provided in the bar 48 adjacent the finger 62,

and the finger 18 provided with an opening 6 Upon the neck 28 is mounted the fan structure 24. I

Referring to Figures 6 and '1, fan units 28 and 28 are mounted on the vertical shaft l8. The units 28 and 28 are spaced vertically one from the other and the blades 38 and 32 of the units 26 and 28, respectively, are interconnected at their ends by vertical blades 34. Bodies 36 fixedly secure the inner ends of the respectiv blades 38 and 32 to the shaft l8.

While the fan units 28 and 28 are fixedly secured to the shaft I8 for rotation therewith as a unit, the blades 38 are of reversed twist with respect to the blades 32 so that the fan unit 26 directs an air stream upwardly axially of the shaft l8 while the fan unit 28 directs an air stream downwardly axially of the shaft. Headon impingement of the oppositely moving air streams one with the other creates a horizontal air stream flowing radially from the axis of the shaft l8 in all directions. Asupplemental lateral deflection of the horizontal air stream is seecured by reason of the two blades 34, which blades the shaft registering with an opening 88 in the tenon 42 of the bar 48, so that the bar and the arm may be fixedly secured through the medium of a rivet 18, as illustrated in Figures 1 and 4. A notch 12 is provided in the inner edge of the bar 48 of Figure 8.

Two bands l4 are placed in the respective notches 64 and 12 at the upper and lower ends of the bars 48, as illustrated in Figure l, which bands engage peripherally with the finger 82 and the bars 48 and are restrained from relative axial movement by reason of being housed in the notches. Wire bands 16 are spaced vertically of 18 and are held in place by notches 18 in the outer edges of the vertical bars 48. Thus the wire bands 18 are restrained from relative movement axially of the bars 48, and the bands are preferably grouped at the lower and upper ends of the frame structure for ornamental purposes, in addition to functioning as structural members in the frame structure 38.

The arms 48 and 48 are so spaced as to permit free circulation of air therebetween. A carrying handle 88 is secured to the hub 52. Upon the shaft I8 inside the housing I8 is secured a fan 82 which draws air through the perforations NS for motor cooling purposes. The air is evacuated through the tubular neck 20 and slots 84 in the hub 50.

The reversed screw or twist of the fan units 26 and 28 balance end thrust on the drive shaft l8 since each fan reacts against the other. The invention described 1n claim 1 wherein The bands 14 lie in the respective planes of the said radial arms are interconnected at their inner two fan units 26 and 28 to afford good protection ends by hubs and in which said hubs are proagainst injury from the blades. vlded with bearings for supporting the drive Without further elaboration, the foregoing will shaft so fully illustrate my invention that others may, 3. The invention described in claim 1 wherein by applying current knowledge, readily adapt the said base comprises a housing having a tubular same for use under various conditions of service. neck supporting said protective frame, in WhlCh claim: said housing is provided with a motor operatlvely 1. An air circulating fan comprising a, vertical connected with said drive shaft and in which said dIlVe shaft vertically spaced fan units fixedly u l r n k i pr v with an v nt n pen- CECIL POFF. 

